Pipe-wrench.



PATENTED JULY 25, 1905.

P. G. CORNELL.

PIPE WRENCH.

APPLIGATION mm mm. as, 1904.

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GIXN bnvuaeo UNITED STATES PATENT OEETCE.

FRANK G. CORNELL, OF LOUISVILLE, KENTUCKY, ASSIGNOR OF ONE FOURTH TO AUGUSTUS E. WVILLSON, OF LOUISVILLE, KENTUCKY.

PIPE-WRENCH.

Specification of Letters Patent.

Patented July 25, 1905.

Application filed March 2 9 Serial 200,305.

To (07 7/ whmn it may concern.-

Be it known that I, FRANK Gr. CORNELL, of Louisville, county of Jefferson, and State of Kentucky, have invented a new and useful Improvement in Piperenches, of which the following is a full, clear, and exact description.

My invention relates to an improvement in pipe-wrenches; and it has for its object to construct a pipe-wrench which will be very simple, durable, and economical in its construction, the movable parts of which may be easily moved to or from or adjusted to and released from the work and rigidly held in place.

This wrench is instantaneous in its adjustment to its work and absolutely releases its hold on the pipe as soon as relieved of the strain on the handle, thereby avoiding the lost motion incident to a pipe-wrench employing a spring.

This improvement makes the wrench very desirable, not only as a general-utility wrench, but especially in many places where the room to work the handle is limited.

This wrench begins to pull on the pipe at the instant it grapples it. It is a sliding-jaw pipe-wrench without any screw, thread, or bolt.

The invention consists in the novel construction and combination of the very few and simple parts, easily and cheaply made and assembled, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters indicate corresponding parts in all the figures.

Figure 1 is a section on line I of Fig. 2 of a pipe-wrench embodying my invention. Fig. 2 is a section on line II of Fig. 1 of the same. Fig. 3 is a perspective view of the movable jaw member. Fig. et is a detail showing the form of the pipe-holding teeth and grooves.

In carrying out the invention the handle a is as described in Figs. 1 and 2, having an elongated slot D, which makes the handle a elastic in its functions, in combination with the rivets F and G and jaws B and C.

It will be seen that the handle a has bosses R It around the rivets F and G. The purpose of these bosses is to thicken the handle where the rivets F and Or go through the handle, first, so there will be no unnecessary side motion of the handle between the sides of the jaws B and C; second, so that the strain of the power applied to the handle will not come in the center of the rivets F and G, but be applied to the jaws Band C at a point 2,, as shown in Fig. 2. Again, it will be seen that the power of the handle a does not come on the rivet F to hold the sliding jaw C to its work, but is applied direct from the end of the handle a to the face metal of the sliding jaw C by the end of the handle a moving in a segment of a perfect circle y, Fig. 1, corresponding to the perfect circle Z of the end of the handle a, as shown in Figs. 1 and 3.

Particular attention is called to the fact that the elongated slot D is set at such an angle and position with reference to the guides E E, as shown in Figs. 1 and 2, that it is practicable to close the jaws B and C of the wrench to its work, with the fixed jaw B sliding in the fixed grooves M in Fig. 3, so as to bring the full faces of the jaws, whether curved or flat, directly to their work, whether on a pipe or round surface or on nuts, and when used on nuts will make it cling to the nut by the lifting action of the handle (a on the rivet G. I have devised a rigid jaw-bar and jaw B, as shown in Figs. 1 and 2, the bar being constructed of two parallel web-like sides, reinforced by parallel guides E E, constructed on the jaw B internally, (or externally, as

shown by the dotted line 0,) as in Fig. 2. I

prefer to have the guides internally, as shown by the shaded drawing E, as in Fig. 2, a patent on this particular construction of jawbar having been applied for by me in an application for a patent in a nut-wrench, filed March 28, 1904, Serial No. 200,303. The only difference between the two applications for patents on the jaw and the bar in combination is that in the pipe-wrench jaw the jaw is concave horizontally, with tooth-like grooves or incisions I, as in Figs. 1 and 4, to keep the jaw from slipping on the pipe, a special feature being that it affords the greatest strength in proportion to the metal and at the same time makes the wrench very light as compared with the common form of jawbar and jaw. In this peculiar combination of jaw-bar and jaw it will be seen that the cast ing is so simple in its construction that the whole can be cast without a core, thus reducing the cost over other forms of jaw and bar. It will be seen by Fig. 2 that the parallel guide-flanges E E furnish a simple and substantial anchorage for the movable jaw C.

The movable jaw U, like the jaw-bar B, is very simple in construction and can be cast without a core. It is constructed of two parallel web-like sides, as shown in Fig. 2, having two parallel grooves M, as shown in Fig. The face of the movable jaw C is concave horizontally, as shown in Figs. 1 and 3, having tooth-like grooves or incisions I, as seen in Figs. 1 and a, for the purpose of keeping the jaw from slipping on the pipe H when applied, as shown in Fig. 1. It will be seen by the dotted lines in Fig. 3 and the shaded metal in Fig. 1 that the inside of the face of the jaw c is concavcd to receive the end of the handle a for the purpose of receiving the power from the handle /I, thus relieving the guides E E from the natural pinching tendency which the jaw C would have if the strain were thrown on the rivet F.

Fig. & shows an enlarged view of the teeth 1, and it will be seen that the grooves or incisions forming the teeth are round at the bottom instead of sharp, as now common in pipe-wrenches The object of these round grooves or incisions is to, lirst, keep scale and dirt from collecting so easily as it does in acute incisions; second, to obviate the danger of fractures being caused by the sharp corners in the metal giving way under excessive strains.

The important result and object in these combinations is to construct a strictly lirstclass pipe-wrench without any need of skilled.

or expensive labor in fitting and assen'ibling the ditlerent parts. Particular attention is called to the fact that no core will be needed in making the castings, that there are only three holes to be drilled and two rivets to be set to assemble the parts of this wrench complete.

Having thus described my invention, I claim as new and desire to sccu re by Letters Patent- 1. In a pipe-wrench the combination of the fixed jaw member, having guides E, the movable jaw member litting and slidable on said guides, the lever-handle having a variable pivotal connection Gr with the lixed jaw member at the outer side of said guides, and having at its end a pivotal connection F with the movable member behind the jaw of the movable member and at the inner or other side of the guides, substantially as set forth.

2. In a pipe-wrench the combination of the main jaw member having a jaw B and guides E, the movable jaw litting said guides, the handle or lever (4 having the slot D, the rivet or pin F connecting the handle with the movable jaw, and the rivet or pin G passing through the slot D and engaging the member B, the said pins F and G being arranged on opposite sides of the said guides, substantially as set forth.

FRANK G. CORNELL. Vitnesses N. K. ROBERTS, ARTHUR E. Horxms. 

